Display posts on parent post if author coincides

I found it (easy one):

In functions.php:

// Allow author for custom post
function allowShowAuthor()
{
  add_post_type_support( 'cust_post-type', 'author' );
}

add_action('init','allowShowAuthor');

In the content template:

<ul class="author-posts">
 <?php
        $current_page_author = get_the_author();
        $catquery = new WP_Query( 'cat=7&posts_per_page=30&order=DESC&author_name=" . $current_page_author );
    while($catquery->have_posts()) : $catquery->the_post();
   ?>
    <li class="author-post"><?php the_content();?></li>
<?php endwhile;?>